XPMorten,
I think there are a few issues here as to how the A320 flight control works
Originally Posted by XPMorten
In fact, I dont think they gave aileron at all during the whole maneuver;
You don't know what the crew did by looking at the outside of the airplane; you only know what the airplane did under the commands given by the crew. If the stick is neutral and the airplane starts to roll, the FBW will countermand the roll because 0 roll rate is commanded by the crew. And to countermand that roll the ailerons may well actuate.
Indeed, on your first grainy still, I see a shadow in the position of the starboard aileron which might will indicate it has risen.
Originally Posted by XPMorten
Wing comes up due to yaw induced roll.
Sorry, as I understand it this does not happen. If sidestick is neutral, wing does not come up due to yaw-roll coupling. The FBW control system compensates for the coupling. (This also answers GMDS's question.)
I think it was a gust.
PBL